/* ==========================================================================
   LAYOUT
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
@media (min-width: 768px) { .container { padding-inline: var(--space-7); } }

.section { padding-block: var(--space-8); }
.section-tight { padding-block: var(--space-6); }
.section-alt { background: var(--color-surface-alt); }
.section-ink { background: var(--color-surface-ink); color: var(--color-surface-ink-text); }
.section-ink h1, .section-ink h2, .section-ink h3 { color: #fff; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

/* ---- Header / nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--color-ink-900);
  flex-shrink: 0;
}
.brand-mark { color: var(--color-accent-500); }

.primary-nav { display: none; }
.primary-nav ul { list-style: none; display: flex; gap: var(--space-6); padding: 0; margin: 0; }
.primary-nav a {
  text-decoration: none;
  color: var(--color-neutral-900);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
}
.primary-nav a:hover, .primary-nav a[aria-current="page"] {
  color: var(--color-primary-500);
  border-bottom-color: var(--color-accent-500);
}
@media (min-width: 960px) {
  .primary-nav { display: block; }
  .nav-toggle { display: none; }
}

.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.search-toggle, .nav-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.mobile-nav.open { display: block; }
.mobile-nav ul { list-style: none; padding: var(--space-4) var(--space-5); margin: 0; display: flex; flex-direction: column; }
.mobile-nav a { display: block; padding: var(--space-3) 0; text-decoration: none; color: var(--color-neutral-900); border-bottom: 1px solid var(--color-border); font-weight: 500; }
@media (min-width: 960px) { .mobile-nav { display: none !important; } }

/* ---- Hero ---- */
.hero {
  display: grid;
  gap: var(--space-7);
  align-items: center;
  padding-block: var(--space-8) var(--space-7);
}
@media (min-width: 900px) {
  .hero { grid-template-columns: 1.1fr 0.9fr; padding-block: var(--space-9) var(--space-8); }
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-500);
  display: flex; align-items: center; gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.hero h1 { font-size: var(--fs-display); margin-bottom: var(--space-5); }
.hero p.lede { font-size: var(--fs-lg); color: var(--color-neutral-600); max-width: 52ch; margin-bottom: var(--space-6); }
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.hero-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}

/* ---- Grids ---- */
.grid { display: grid; gap: var(--space-6); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(1, 1fr); }
@media (min-width: 640px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---- Category feature strip ---- */
.category-strip { display: flex; gap: var(--space-4); overflow-x: auto; padding-bottom: var(--space-2); scrollbar-width: thin; }
.category-chip {
  flex-shrink: 0;
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  text-decoration: none;
  color: var(--color-ink-900);
  font-size: var(--fs-sm);
  font-weight: 500;
  background: var(--color-surface);
  transition: border-color var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard);
}
.category-chip:hover { border-color: var(--color-primary-500); color: var(--color-primary-500); }

/* ---- Article + sidebar layout ---- */
.article-layout {
  display: grid;
  gap: var(--space-8);
}
@media (min-width: 960px) {
  .article-layout { grid-template-columns: minmax(0, var(--article-width)) 300px; align-items: start; }
}
.article-main { min-width: 0; }
.sidebar { display: flex; flex-direction: column; gap: var(--space-6); position: sticky; top: 96px; }

.article-body { font-size: var(--fs-lg); }
.article-body > * + * { margin-top: var(--space-5); }
.article-body h2 { margin-top: var(--space-8); scroll-margin-top: 96px; }
.article-body h3 { margin-top: var(--space-6); scroll-margin-top: 96px; }
.article-body ul, .article-body ol { padding-left: 1.4em; }
.article-body li + li { margin-top: var(--space-2); }

/* ---- Footer ---- */
.site-footer { background: var(--color-surface-ink); color: var(--color-surface-ink-text); padding-block: var(--space-8) var(--space-6); margin-top: var(--space-9); }
.footer-grid { display: grid; gap: var(--space-7); grid-template-columns: 1fr; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); } }
.footer-brand p { color: var(--color-neutral-400); max-width: 40ch; margin-top: var(--space-3); font-size: var(--fs-sm); }
.footer-col h4 { color: #fff; font-family: var(--font-body); font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-4); }
.footer-col ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a { color: var(--color-neutral-400); text-decoration: none; font-size: var(--fs-sm); transition: color var(--duration-fast) var(--ease-standard); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--color-neutral-400);
}
.social-links { display: flex; gap: var(--space-3); }
.social-links a {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  color: #fff;
}

/* ---- Utility ---- */
.text-center { text-align: center; }
.max-w-prose { max-width: 65ch; }
.mx-auto { margin-inline: auto; }